Gear-cutting machine.



C. A. PARSONS,A Q'. CARNEGIE & S. S. COOK-v GEAH CUTTING MACHINE.

APPLICATION FILED 0m13.191s.

1,1 92,450., Patented July 25, 1916.

CHARLES A. PARSONS AND ALFRED QUINTIN CARNEGIE, 0F NEWCASTLE-UION-TYNE,

AND STANLEY SMITH COOK, 0F WALLSEND, ENGLAND; SAID CARNEGIE-AND COOK ASSIGNORS TO SAID PARSONS.

GEAR-CUTTING MACHINE.

specification of Letters raient.

Patented duly 25,1916.

Original application filed 'March 25, 1913, Serial No. 756,762. Divided and this application filed December 13, 1913. Serial No.- 806,567.

To aZZ whom t may concern:

Be it known that we, CHARLES ALGnnNoN PARSONS, K. C. B., and ALFRED QUINTIN CARNnGm, of Heaton Works, Newcastleupon-Tyne, Northumberland, England, and STANLEY SMITH Coon, of Turbinia Works, Wallsend, Northumberland, England, subjects of the King of Great Britain and Ireland, have 'invented certain new and useful Improvements in Grear-Cutting Machines, of which the following is the specification.

This invention relates to methods and meansI for cutting the teeth in gear wheels, such as is described in our application, Serial No. 756,762 filed March 25, 1913.

Referring to the accompanying drawings, Figure 1 is Aa cross 'sectional elevation through the work carrying table of a gear cutting machine embodying the present invention; Fig. 2 is a part sectional plan of Fig. 1.

In carrying the invention into effect according to the present construction, a work carrying table a is provided, constrained to rotate about its axis by a bearing, b, in the bed member, c. Concentric to the table, a, and surrounding the same, is a ring member, cl, having upon its outer periphery worm wheel teeth, e, and upon its upper periphery, spur wheel teeth, f. The indexing member, (Z, or parent gear is constrained to rotate concentric with the table, a, by a circular depending portion g extending into a groove in the bed member c. Upon the table, a, bearings, h y', are provided, in which rotates the spindle, k, carrying at one end a spur wheel, Z, engaging the teeth, f, and near its middle a spur wheel, m, adapted to engage a spur wheel, a, carried by a shaft 0, in bearings, p and (1, upon the bed. rl`he shaft, 0, also carries a worm wheel, fr', which engages a worin, s, mounted upon the central spindle,`i,`"which isifixed to the bed, c, by the stud, u. The worm wheel teeth, e, are engaged by the worm, lvhwhich is driven by suitable gearing in the wellhknown manner.

The action of. the apparatus is as follows :flipon the worm, o, being rotated, the indexing member or parent gear, eZ, rotates about its axis, and in so doing tends to rotate the pinion, Z, shaft, 7c, and pinion, m.. The pinion, m, engaging the pinion, a, tends 4the stationary worm,

ktable on which 'the work to cause rotation of the shaft, 0, and consequently the worm wheel, r. As the pinion, Z, cannot rotate freely owing to the engagement between r and s, the table is carried around in the same direction as d, but 'in so doing, the worm wheel, r, is moved around s, and consequently rotation of the Worm wheel, r, takes place, which rotation is transmitted to the pinion, Z. It will beyunderstood that the rotary motion, due to the movement of r bodily around s is superposed upon the rotary motion caused by engagement of the teeth, f, with the pinion, Z, and causes a relative movement between the table, a, and the ring d. With the worm, s, right handed, as shown in the drawing, the superposed rotary motion will cause an advance of the table in the direction of rotation of the member, d.

Having now described our invention,what f we claim as new and desire to secure by Letters Patent is 1. A gear cutting machine, comprising a is mounted, a parent gear, having a driving and a driven member means between said driven member and said table whereby said table is rotated by said driven member but at a dilferent rate therefrom.

2. A gear cutting machine comprising a table on which the work is mounted, a parent gear, having a driving and a driven member said driven member being concentric with said' tablefmeans between said driven member and said table whereby said table is rotated by said driven member but at a different rate therefrom.

3. A gear cutting machine comprising a parent gear having a member a table on which the work is mounted a train of gearing attached to'said table and gearing with said driven member of the parent gear whereby said table is 'rotated by said driven 'member but at a diEerent rate therefrom.

4. A gear cutting machine comprising a work carrying table a ring member concentric therewith worm teeth upon said member bevel teeth upon said member a worm cngaging said worm teeth whereby said ring member is rotated two parallel shafts mounted in said table a bevel pinion on one of .said shafts whereby its Shaft is rotated driving and a driven ing said worm wheel and secured to a staf ticrllary shaft positioned coaxially with the ta e.

5. In combination in a gear cutting Inachine, a work-table, a ring member, means to rotate said ring, and means between said table and said ring acting to rotate said table from said ring and at a different rate therefrom.

6. In combination in a gear cutting Inachine, a ring member., a work table adapten vto rotate about anvaxis -lying within the circumference of Said ring, means to rotate said ring, and means between said table and I said ring acting to rotate Said table from said ring and atadifferent rate therefrom.

In testimony whereof, we affix our Signa-` tures in presence of two witnesses.

Witnesses:

FRE'lmRIeK GORDON HAY BInFoRD, ALBERI' WILLIAM PARR. 

